David Lightman | (TNS) McClatchy Washington Bureau WASHINGTON — Donald Trump and Kamala Harris agree on this much: Groceries cost too much. But despite promises from each presidential candidate that they’ll take bold steps to stop the price madness, experts say there’s probably little they can do. “The rate of price growth has reverted back to normal, but prices will not go back down,” said Aaron Smith, professor of agricultural and resource economics at University of California, Berkeley. Harris vows to curb what she called grocery price gouging.